There are really only 2 players in the exciting 3D printing business (3D, DDD and Stratasys, SSYS) so there probably aren't any funds concentrating on the sector -- yet.

I've bought and sold 200 shares of DDD several times this year, making about $3500 in profits overall. I'm long the stock now and expect to keep it in my portfolio for the foreseeable future (not necessarily the same shares, because I will probably keep selling on the upswings and buying on the dips). For whatever my opinion is worth!

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